ALTER TABLE table_name ADD SUPPLEMENTAL LOG GROUP log_group_name (column1, column2, column3) ALWAYS; 开启ALL 级别的补偿日志的方式如下: --方式一:开启 DataBase 级别 ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS; --
CREATE TABLE table_name ( ... ) PARTITION BY RANGE(column1) INTERVAL expr [STORE IN (tablespace1,[tablespace2,...])] ( PARTITION partition_name1 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablespace1], PARTITION partition_name2 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablesp...
PARTITION t1_le_101 VALUES LESS THAN (101) ) INCLUDING ROWS WHERE id <= 50; 1. 2. 3. 4. 5. 6. 注意including row 后跟的条件为保留的数据,千万别写反 ORACLE-BASE - Filtered Partition Maintenance Operations in Oracle Database 12c Release 2 (12.2) Partitioning: Multi-Column List Partitionin...
This articleby Younes Naguib describes how to display multiple values from a single column in a single output row. In his example, he displays multiple values of the last name column on a single row. Note his use of thesys_connect_by_pathandoveroperators: select deptno, substr(SYS_CONNECT_...
NOLOGGING 关键字可以大大减少索引创建的时间。SQL 语句与下面语句相似: CREATE INDEX indexname ON table(column) NOLOGGING; 注意,如果在执行一个不能恢复的语句之后,在某点发生了系统失效,你将不能使用回滚机制来恢复这个事务,你必须意识到一个系统失效已经发生并且要重新运行语句。
ALTERTABLEt_operate_logADDPARTITION t_operate_log_4VALUESLESS THAN(400); 1. 但是要注意一点,如果一个分区的范围是maxvalue(比如把300替换成maxvalue),添加分区会失败。 我们也可以用下面命令删除一个分区: 复制 ALTERTABLEt_operate_logDROPPARTITION t_operate_log_4; ...
7 partition xff_2009 values less than (TO_DATE('01-01-2010','dd-MM-yyyy'))); Table created. SQL> SET LONG 30 SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI'; PARTITION_NAME HIGH_VALUE ...
(new.title,'')); END IF; return new; END $$ LANGUAGE plpgsql; CREATE TRIGGER trig_tsv_t_document_title BEFORE INSERT OR UPDATE ON t_document FOR EACH ROW EXECUTE PROCEDURE tsv_t_document_title(); When the Oracle text index is defined over multiple column, Ora2Pg will use setweight(...
When to Partition an Index Here are some suggestions for when to consider partitioning an index: Avoidrebuilding the entire indexwhendataisremoved. Performmaintenance on parts of the data without invalidating the entire index. Reducethe impact of index skew causedbyan index on a columnwitha monoton...
In the LOCATION clause, the files are named in the form directory:file , and one clause can specify multiple files. The directory portion is optional. The following rules apply for the directory used by a partition or subpartition: When a directory is specified in the LOCATION clause for a ...